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Some experimentation and feedback:
I added ten feet to the mast (Channel Master 5-foot mast, item # 1805, I used two). I was surprised what a difference this made:
-with the old style, salvaged antenna, pointed to about true north 210, every channel was a little stronger, and I now get real CH-25 and CH-39, so I was only missing CH-13 and CH-38 from my goal channels
-with the antennas direct CV-2, also pointed to about 210, the results were rather impressive: nearly everything I care about was watchable, but CH-38 was still completely absent.
-with this latter arrangement, CH-13 was now arriving, but the signal was weak and unwatchable. The tuner seemed to go to CH-13 twice when browsing (perhaps it was receiving both CH-13 and real CH-22 and getting confused)? Also, CH-13 was arriving via virt 22.2, completely watchable. Perhaps this is where my tuner decided to park real CH-22 (the Seattle based signal for FOX)?
I'm pleased with these results, and it suggests I can get everything I want with one antenna (the CV-2). I can just delete channel 13 from the tuner and get that broadcast via 22.2, or perhaps a selective filter would be better?
What still puzzles me is this:
-why virtual CH-4 (real CH-38) is now absent: previously I was readily able to get it. Virtual CH-4, CH-5, CH-7 are nearly identical transmitter locations.
-would a selective bandpass filter removing real CH-13 be better to avoid interference instead of simply deleting channel 13 from the tuner memory? Tinlee makes such products.
If anyone in the Seattle area has insight into this I would greatly appreciate it.
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